Wheat variety 25R78

ABSTRACT

A wheat variety designated 25R78, the plants and seeds of wheat variety 25R78, methods for producing a wheat plant produced by crossing the variety 25R78 with itself or with another wheat plant, and hybrid wheat seeds and plants produced by crossing the variety 25R78 with another wheat line or plant, and the creation of variants by mutagenesis or transformation of variety 25R78. This invention also relates to methods for producing other wheat varieties or breeding lines derived from wheat variety 25R78 and to wheat varieties or breeding lines produced by those methods.

FIELD OF INVENTION

This invention is in the field of wheat (Triticum aestivum L.) breeding, specifically relating to a wheat variety designated 25R78.

BACKGROUND OF INVENTION

Wheat is grown worldwide and is the most widely adapted cereal. There are five main wheat market classes. They include the four common wheat (Triticum aestivum L.) classes: hard red winter, hard red spring, soft red winter, and white. The fifth class is durum (Triticum turgidum L.). Common wheats are used in a variety of food products such as bread, cookies, cakes, crackers, and noodles. In general the hard wheat classes are milled into flour used for breads and the soft wheat classes are milled into flour used for pastries and crackers. Wheat starch is used in the food and paper industries, as laundry starches, and in other products. Because of its use in baking, the grain quality of wheat is very important. To test the grain quality of wheat for use as flour, milling properties are analyzed. Important milling properties are relative hardness or softness, weight per bushel of wheat (test weight), siftability of the flour, break flour yield, middlings flour yield, total flour yield, flour ash content, and wheat-to-flour protein conversion. Good processing quality for flour is also important. Good quality characteristics for flour from soft wheats include low to medium-low protein content, a low water absorption, production of large-diameter test cookies and large volume cakes. Wheat glutenins and gliadins, which together confer the properties of elasticity and extensibility, play an important role in the grain quality. Changes in quality and quantity of these proteins change the end product for which the wheat can be used.

The present invention relates to a new and distinctive wheat variety, designated 25R78 which has been the result of years of careful breeding and selection as part of a wheat breeding program. There are numerous steps in the development of any novel, desirable plant germplasm. Plant breeding begins with the analysis and definition of problems and weaknesses of the current germplasm, the establishment of program goals, and the definition of specific breeding objectives. The next step is selection of germplasm that possess the traits to meet the program goals. The goal is to combine in a single variety an improved combination of desirable traits from the parental germplasm. These important traits may include higher seed yield, resistance to diseases and insects, tolerance to drought and heat, improved grain quality, and better agronomic qualities.

Field crops are bred through techniques that take advantage of the plant's method of pollination. A plant is self-pollinated if pollen from one flower is transferred to the same or another flower of the same plant. A plant is sib-pollinated when individuals within the same family or line are used for pollination. A plant is cross-pollinated if the pollen comes from a flower on a different plant from a different family or line. The term cross-pollination herein does not include self-pollination or sib-pollination. Wheat plants (Triticum aestivum L.), are recognized to be naturally self-pollinated plants which, while capable of undergoing cross-pollination, rarely do so in nature. Thus intervention for control of pollination is critical to the establishment of superior varieties.

A cross between two different homozygous lines produces a uniform population of hybrid plants that may be heterozygous for many gene loci. A cross of two heterozygous plants each that differ at a number of gene loci will produce a population of plants that differ genetically and will not be uniform. Regardless of parentage, plants that have been self-pollinated and selected for type for many generations become homozygous at almost all gene loci and produce a uniform population of true breeding progeny. The term “homozygous plant” is hereby defined as a plant with homozygous genes at 95% or more of its loci. The term “inbred” as used herein refers to a homozygous plant or a collection of homozygous plants.

Choice of breeding or selection methods depends on the mode of plant reproduction, the heritability of the trait(s) being improved, and the type of variety used commercially (e.g., F₁ hybrid variety, pureline variety, etc.). For highly heritable traits, a choice of superior individual plants evaluated at a single location will be effective, whereas for traits with low heritability, selection should be based on mean values obtained from replicated evaluations of families of related plants. Popular selection methods commonly include pedigree selection, modified pedigree selection, mass selection, and recurrent selection.

The complexity of inheritance influences choice of the breeding method. In general breeding starts with the crossing of two genotypes, each of which may have one or more desirable characteristics that is lacking in the other or which complements the other. If the two original parents do not provide all the desired characteristics, other sources can be included by making more crosses. In each successive filial generation, F₁→F₂; F₂→F₃; F₃→F₄; F₄→F₅, etc., plants are selfed to increase the homozygosity of the line. Typically in a breeding program five or more generations of selection and selfing are practiced to obtain a homozygous plant.

Pedigree breeding is commonly used for the improvement of self-pollinating crops. Two parents that possess favorable, complementary traits are crossed to produce an F₁. An F₂ population is produced by selfing one or several F₁'s or by sib-pollinating two F₁'s. Selection of the best individuals may begin in the F₂ population; then, beginning in the F₃, the best individuals in the best families are selected. Replicated testing of families can begin in the F₄ generation to improve the effectiveness of selection for traits with low heritability.

At an advanced stage of inbreeding (i.e., F₆ and F₇), the best lines or mixtures of phenotypically similar lines are tested for potential release as new varieties.

Backcross breeding has been used to transfer genes for simply inherited, highly heritable traits from a donor parent into a desirable homozygous variety that is utilized as the recurrent parent. The source of the traits to be transferred is called the donor parent. After the initial cross, individuals possessing the desired trait or traits of the donor parent are selected and then repeatedly crossed (backcrossed) to the recurrent parent. The resulting plant is expected to have the attributes of the recurrent parent (e.g., variety) plus the desirable trait or traits transferred from the donor parent. This approach has been used extensively for breeding disease resistant varieties.

Each wheat breeding program should include a periodic, objective evaluation of the efficiency of the breeding procedure. Evaluation criteria vary depending on the goal and objectives, but should include gain from selection per year based on comparisons to an appropriate standard, overall value of the advanced breeding lines, and number of successful varieties produced per unit of input (e.g., per year, per dollar expended, etc.).

Various recurrent selection techniques are used to improve quantitatively inherited traits controlled by numerous genes. The use of recurrent selection in self-pollinating crops depends on the ease of pollination and the number of hybrid offspring from each successful cross.

Mass selection and recurrent selection can be used to improve populations of either self- or cross-pollinated crops. A genetically variable population of heterozygous individuals is either identified or created by intercrossing several different parents. The best plants are selected based on individual superiority, outstanding progeny, or excellent combining ability. The selected plants are intercrossed to produce a new population in which further cycles of selection are continued.

The single-seed descent procedure in the strict sense refers to planting a segregating population, harvesting a sample of one seed per plant, and using the one-seed sample to plant the next generation. When the population has been advanced from the F₂ to the desired level of inbreeding, the plants from which lines are derived will each trace to different F₂ individuals. The number of plants in a population declines each generation due to failure of some seeds to germinate or some plants to produce at least one seed. As a result, not all of the F₂ plants originally sampled in the population will be represented by a progeny when generation advance is completed.

In a multiple-seed procedure, wheat breeders commonly harvest one or more spikes (heads) from each plant in a population and thresh them together to form a bulk. Part of the bulk is used to plant the next generation and part is put in reserve. The procedure has been referred to as modified single-seed descent. The multiple-seed procedure has been used to save labor at harvest. It is considerably faster to thresh spikes with a machine than to remove one seed from each by hand for the single-seed procedure. The multiple-seed procedure also makes it possible to plant the same number of seeds of a population each generation of inbreeding. Enough seeds are harvested to make up for those plants that did not germinate or produce seed.

Molecular markers including techniques such as Starch Gel Electrophoresis, Isozyme Eletrophoresis, Restriction Fragment Length Polymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats (SSRs), and Single Nucleotide Polymorphisms (SNPs) may be used in plant breeding methods. One use of molecular markers is Quantitative Trait Loci (QTL) mapping. QTL mapping is the use of markers, which are known to be closely linked to alleles that have measurable effects on a quantitative trait. Selection in the breeding process is based upon the accumulation of markers linked to the positive effecting alleles and/or the elimination of the markers linked to the negative effecting alleles from the plant's genome.

Molecular markers can also be used during the breeding process for the selection of qualitative traits. For example, markers closely linked to alleles or markers containing sequences within the actual alleles of interest can be used to select plants that contain the alleles of interest during a backcrossing breeding program. The markers can also be used to select for the genome of the recurrent parent and against the markers of the donor parent. Using this procedure can minimize the amount of genome from the donor parent that remains in the selected plants. It can also be used to reduce the number of crosses back to the recurrent parent needed in a backcrossing program. The use of molecular markers in the selection process is often called Genetic Marker Enhanced Selection.

The production of double haploids can also be used for the development of homozygous lines in the breeding program. Double haploids are produced by the doubling of a set of chromosomes (1 N) from a heterozygous plant to produce a completely homozygous individual. This can be advantageous because the process omits the generations of selfing needed to obtain a homogygous plant from a heterozygous source. Various methodologies of making double haploid plants in wheat have been developed (Laurie, D. A. and S. Reymondie, Plant Breeding, 1991, v. 106:182-189. Singh, N. et al., Cereal Research Communications, 2001, v. 29:289-296; Redha, A. et al., Plant Cell Tissue and Organ Culture, 2000, v. 63:167-172; U.S. Pat. No. 6,362,393)

Though pure-line varieties are the predominate form of wheat grown for commercial wheat production hybrid wheat is also used. Hybrid wheats are produced with the help of cytoplasmic male sterility, nuclear genetic male sterility, or chemicals. Various combinations of these three male sterility systems have been used in the production of hybrid wheat.

Descriptions of other breeding methods that are commonly used for different traits and crops can be found in one of several reference books (e.g., Allard, Principles of Plant Breeding, 1960; Simmonds, Principles of Crop Improvement, 1979; editor Heyne, Wheat and Wheat Improvement, 1987; Allan, “Wheat”, Chapter 18, Principles of Crop Development, vol. 2, Fehr editor, 1987).

Promising advanced breeding lines are thoroughly tested and compared to appropriate standards in environments representative of the commercial target area(s). The best lines are candidates for new commercial varieties; those still deficient in a few traits may be used as parents to produce new populations for further selection.

A most difficult task is the identification of individuals that are genetically superior, because for most traits the true genotypic value is masked by other confounding plant traits or environmental factors. One method of identifying a superior genotype is to observe its performance relative to other experimental genotypes and to a widely grown standard variety. Generally a single observation is inconclusive, so replicated observations are required to provide a better estimate of its genetic worth.

Thus, even if the parental genotypes of the breeding cross were characterized and a desired genotype known, only a few if any individuals having the desired genotype may be found in a large segregating F₂ population. Typically, however, neither the genotypes of the breeding cross parents nor the desired genotype to be selected is known in any detail. In addition to the preceding problem, it is not known how the genotype would react with the environment. This genotype by environment interaction is an important, yet unpredictable, factor in plant breeding. A breeder of ordinary skill in the art cannot predict the genotype, how that genotype will interact with various climatic conditions or the resulting phenotypes of the developing lines, except perhaps in a very broad and general fashion. It would be very unlikely that a breeder of ordinary skill in the art would be able to recreate the same line twice from the very same original parents as the breeder is unable to direct how the genomes combine or how they will interact with the environmental conditions. This unpredictability results in the expenditure of large amounts of research resources in the development of a superior new wheat variety.

A breeder uses various methods to help determine which plants should be selected from the segregating populations and ultimately which lines will be used for commercialization. In addition to the knowledge of the germplasm and other skills the breeder uses, a part of the selection process is dependent on experimental design coupled with the use of statistical analysis. Experimental design and statistical analysis are used to help determine which plants, which family of plants, and finally which lines are significantly better or different for one or more traits of interest. Experimental design methods are used to control error so that differences between two lines can be more accurately determined. Statistical analysis includes the calculation of mean values, determination of the statistical significance of the sources of variation, and the calculation of the appropriate variance components. Five and one percent significance levels are customarily used to determine whether a difference that occurs for a given trait is real or due to the environment or experimental error.

Even with the various tools available to the breeder, it is difficult to identify individuals that are genetically superior, because for most traits the true genotypic value is masked by other confounding plant traits or environmental factors. Furthermore, replicated observations and measurements done to help remove environmental effects are limited by seed amounts in the early generations of selfing and selection.

The goal of wheat breeding is to develop new, unique and superior wheat varieties. In practical application of a chosen wheat breeding program, the breeder initially selects and crosses two or more parental lines, followed by repeated selfing and selection, producing many new genetic combinations. The breeder can theoretically generate billions of different genetic combinations via crossing, selfing and mutations. The breeder has no direct control at the cellular level. Therefore, two breeders will never develop the same line, or even very similar lines, having the same wheat traits.

Each year, the plant breeder selects the germplasm to advance to the next generation. This germplasm is grown under unique and different geographical, climatic and soil conditions, and further selections are then made during and at the end of the growing season. The varieties which are developed are unpredictable for the reasons already mentioned.

Proper testing should detect major faults and establish the level of superiority or improvement over current varieties. In addition to showing superior performance, there must be a demand for a new variety. The new variety must be compatible with industry standards, or must create a new market. The introduction of a new variety may incur additional costs to the seed producer, the grower, processor and consumer, for special advertising and marketing, altered seed and commercial production practices, and new product utilization. The testing preceding release of a new variety should take into consideration research and development costs as well as technical superiority of the final variety. It must also be feasible to produce seed easily and economically.

These processes, which lead to the final step of marketing and distribution, can take from six to twelve years from the time the first cross is made. Therefore, development of new varieties is a time-consuming process that requires precise forward planning, efficient use of resources, and a minimum of changes in direction.

Wheat (Triticum aestivum L.), is an important and valuable field crop. Thus, a continuing goal of wheat breeders is to develop stable, high yielding wheat varieties that are agronomically sound and have good grain quality for its intended use. To accomplish this goal, the wheat breeder must select and develop wheat plants that have the traits that result in superior varieties.

SUMMARY OF INVENTION

According to the invention, there is provided a novel wheat variety, designated 25R78. This invention thus relates to the seeds of wheat variety 25R78, to the plants of wheat variety 25R78 and to methods for producing a wheat plant produced by crossing wheat variety 25R78 with another wheat plant, and the creation of variants by mutagenesis or transformation of wheat 25R78. This invention also relates to methods for producing other wheat varieties or breeding lines derived from wheat variety 25R78 and to wheat varieties or breeding lines produced by those methods. Wheat variety 25R78 demonstrates a unique combination of traits including excellent yield potential and test weight, early maturity, very good leaf rust resistance, good powdery mildew resistance, very good winter hardiness and very good milling qualities.

DETAILED DESCRIPTION OF INVENTION

A wheat variety needs to be highly homogeneous, homozygous and reproducible to be useful as a commercial variety. There are many analytical methods available to determine the homozygotic stability, phenotypic stability, and identity of these varieties.

The oldest and most traditional method of analysis is the observation of phenotypic traits. The data is usually collected in field experiments over the life of the wheat plants to be examined. Phenotypic characteristics most often observed are for traits such as seed yield, head configuration, glume configuration, seed configuration, lodging resistance, disease resistance, maturity, etc.

In addition to phenotypic observations, the genotype of a plant can also be examined. There are many laboratory-based techniques available for the analysis, comparison and characterization of plant genotype; among these are Gel Electrophoresis, Isozyme Electrophoresis, Restriction Fragment Length Polymorphisms (RFLPs), Randomly Amplified Polymorphic DNAs (RAPDs), Arbitrarily Primed Polymerase Chain Reaction (AP-PCR), DNA Amplification Fingerprinting (DAF), Sequence Characterized Amplified Regions (SCARs), Amplified Fragment Length Polymorphisms (AFLPs), Simple Sequence Repeats (SSRs) which are also referred to as Microsatellites, and Single Nucleotide Polymorphisms (SNPs). Gel electrophoresis is particularly useful in wheat. Wheat variety identification is possible through electrophoresis of gliadin, glutenin, albumin and globulin, and total protein extracts (Bietz, J. A., pp. 216-228, “Genetic and Biochemical Studies of Nonenzymatic Endosperm Proteins” In Wheat and Wheat Improvement, ed. E. G. Heyne, 1987).

The variety of the invention has shown uniformity and stability for all traits, as described in the following variety description information. It has been self-pollinated a sufficient number of generations, with careful attention to uniformity of plant type to ensure homozygosity and phenotypic stability. The line has been increased with continued observation for uniformity. No variant traits have been observed or are expected in 25R78, as described in Table 1 (Variety Description Information).

Wheat variety 25R78 is a common, soft red winter wheat variety. 25R78 demonstrates excellent yield potential and test weight. Variety 25R78 has early maturity and very good winter hardiness. The variety also displays very good leaf rust and good powdery mildew resistance. Variety 25R78 is particularly adapted to the Northern area and Mid-south of North America. This variety also produces grain with very good milling qualities.

Wheat variety 25R78, being substantially homozygous, can be reproduced by planting seeds of the line, growing the resulting wheat plants under self-pollinating or sib-pollinating conditions, and harvesting the resulting seed, using techniques familiar to the agricultural arts.

Definitions for Area of Adaptability

When referring to area of adaptability, such term is used to describe the location with the environmental conditions that would be well suited for this wheat variety. Area of adaptability is based on a number of factors, for example: days to heading, winter hardiness, insect resistance, disease resistance, and drought resistance. Area of adaptability does not indicate that the wheat variety will grow in every location within the area of adaptability or that it will not grow outside the area.

Northern area=States of DE, IL, IN, MI, MO, NJ, NY, OH, PA, WI and Ontario,

Canada

Mid-south=States of AR, KY, MO bootheel and TN

Southeast=States of NC, SC, and VA

Deep South=States of AL, GA, LA, and MS

TABLE 1 VARIETY DESCRIPTION INFORMATION 25R78 1. KIND: 1 1 = Common 2 = Durum 3 = Club 4 = Other 2. VERNALIZATION: 2 1 = Spring 2 = Winter 3 = Other 3. COLEOPTILE ANTHOCYANIN: 1 1 = Absent 2 = Present 4. JUVENILE PLANT GROWTH: 2 1 = Prostrate 2 = Semi-erect 3 = Erect 5. PLANT COLOR (boot stage): 2 1 = Yellow-Green 2 = Green 3 = Blue-Green 6. FLAG LEAF (boot stage): 1 1 = Erect 2 = Recurved 7. FLAG LEAF (boot stage): 2 1 = Not Twisted 2 = Twisted 8. EAR EMERGENCE: 5 Number of Days Earlier than variety 2540  Number of Days Later than   9. ANTHER COLOR: 1 1 = Yellow 2 = Purple 10. PLANT HEIGHT (from soil to top of head: excluding awns):   cm Taller than    4 cm Shorter than variety 2540 11. STEM A. ANTHOCYANIN: 1 1 = Absent 2 = Present B. WAXY BLOOM: 1 1 = Absent 2 = Present C. HAIRINESS (last internode of rachis): 2 1 = Absent 2 = Present D. INTERNODE: 1 1 = Hollow 2 = Semi-solid 3 = Solid 12. HEAD (at maturity) A. DENSITY: 2 1 = Lax 2 = Middense 3 = Dense B. SHAPE: 2 1 = Tapering 2 = Strap 3 = Clavate 4 = Other C. CURVATURE: 3 1 = Erect 2 = Inclined 3 = Recurved D. AWNEDNESS: 4 1 = Awnless 2 = Apically Awnletted 3 = Awnletted 4 = Awned 13. GLUMES (at Maturity): A. COLOR: 2 1 = White 2 = Tan 3 = Other B. SHOULDER: 3 1 = Wanting 2 = Oblique 3 = Rounded 4 = Square 5 = Elevated 6 = Apiculate C. BEAK: 3 1 = Obtuse 2 = Acute 3 = Acuminate D. LENGTH: 2 1 = Short (ca. 7 mm) 2 = Medium (ca. 8 mm) 3 = Long (ca. 9 mm) E. WIDTH: 2 1 = Narrow (ca. 3 mm) 2 = Medium (ca. 3.5 mm) 3 = Wide (ca. 4 mm) 14. SEED: A. SHAPE: 2 1 = Ovate 2 = Oval 3 = Elliptical B. CHEEK: 1 1 = Rounded 2 = Angular C. BRUSH: 1 1 = Short 2 = Medium 3 = Long BRUSH: 1 1 = Not Collared 2 = Collared D. CREASE: 1 1 = Width 60% or less of Kernel 2 = Width 80% or less of Kernel 3 = Width Nearly as Wide as Kernel CREASE: 2 1 = Depth 20% or less of Kernel 2 = Depth 35% or less of Kernel 3 = Depth 50% or less of Kernel E. COLOR: 3 1 = White 2 = Amber 3 = Red 4 = Other F. TEXTURE: 2 1 = Hard 2 = Soft G. PHENOL REACTION: 3 1 = Ivory 2 = Fawn 3 = Light Brown 4 = Dark Brown 5 = Black 15. DISEASE: (0 = Not tested 1 = Susceptible 2 = Resistant 3 = Intermediate 4 = Tolerant) SPECIFIC RACE OR STRAIN TESTED Stem Rust (Puccinia graminis f. sp. tritici): 0 Stripe Rust (Puccinia striiformis): 0 Tan Spot (Pyrenophora tritici-repentis): 3 Field races Halo Spot (Selenophoma donacis): 0 Septoria nodorum (Glume Blotch): 3 Field races Septoria avenae (Speckled Leaf Disease): 0 Septoria tritici (Speckled Leaf Blotch): 3 Field races Scab (Fusarium spp.): 1 Leaf Rust (Puccinia recondite f. sp. tritici): 2 Field races Loose Smut (Ustilago tritici): 0 Flag Smut (Urocystis agropyri): 0 Common Bunt (Tilletia tritici or T. laevis): 0 Dwarf Bunt (Tilletia controversa): 0 Karnal Bunt (Tilletia indica): 0 Powdery Mildew (erysiphe graminis f. sp. tritici): 3 Field races “Snow Molds”: 1 “Black Point” (Kernel Smudge): 0 Barley Yellow Dwarf Virus (BYDV): 0 Soilborne Mosaic Virus (SBMV): 3 Field races Wheat Streak Mosaic Virus (WSMV): 0 Common Root Rot (Fusarium, Cochliobolus, and Bipolaris spp.): 0 Rhizoctonia Root Rot (Rhizoctonia solani): 0 Black Chaff (Xanthomonas campestris pv. translucens): 0 Bacterial Leaf Blight (pseudomonas syringae pv. syringae): 0 16. INSECT: (0 = Not tested 1 = Susceptible 2 = Resistant 3 = Intermediate 4 = Tolerant Hessian Fly (Mayetiola destructor): 1 Biotypes E & L Stem Sawfly (Cephus spp.): 0 Cereal Leaf Beetle (Oulema melanopa): 0 Russian Aphid (Diuraphis noxia): 0 Greenbug (schizaphis graminum): 0 Aphids: 0 For more information on descriptive factors see “Objective Description of Variety Wheat (Triticum supp.)” which is a part of “Application for Plant Variety Protection Cenificat” distributed by U.S. Department of Agriculture, Agricultural Marketing Service, Science and Technology, Plant Variety Protection Office, Beltsville MD 20705. All colors are defined using Munsell Color Charts for Plant Tissues.

FURTHER EMBODIMENTS OF THE INVENTION

Sterility and Tissue Culture Regeneration

Wheat variety 25R78 may be manipulated to be male sterile using methods described herein and/or methods known to those of ordinary skill in the art. Descriptions of some of the cytoplasmic male sterility genes, nuclear male sterility genes, chemical hybridizing agents, male fertility restoration genes, and methods of using the aforementioned are discussed in “Hybrid Wheat by K. A. Lucken (pp. 444-452 In Wheat and Wheat Improvement, ed. Heyne, 1987).

Further reproduction of the wheat variety 25R78 can occur by tissue culture and regeneration. Tissue culture of various tissues of wheat and regeneration of plants therefrom is well known and widely published. A review of various wheat tissue culture protocols can be found in “In Vitro Culture of Wheat and Genetic Transformation-Retrospect and Prospect” by Maheshwari et al. (Critical Reviews in Plant Sciences, 14(2): pp149-178, 1995). Thus, another aspect of this invention is to provide cells which upon growth and differentiation produce wheat plants capable of having the physiological and morphological characteristics of wheat variety 25R78.

As used herein, the term plant includes plant protoplasts, plant cell tissue cultures from which wheat plants can be regenerated, plant calli, plant clumps, and plant cells that are intact in plants or parts of plants, such as embryos, pollen, ovules, seed, flowers, florets, heads, spikes, leaves, roots, root tips, anthers, and the like.

Transformation of Wheat

The advent of new molecular biological techniques has allowed the isolation and characterization of genetic elements with specific functions, such as encoding specific protein products. Scientists in the field of plant biology developed a strong interest in engineering the genome of plants to contain and express foreign genetic elements, or additional, or modified versions of native or endogenous genetic elements in order to alter the traits of a plant in a specific manner. Any DNA sequences, whether from a different species or from the same species, that are inserted into the genome using transformation are referred to herein collectively as “transgenes”. Over the last fifteen to twenty years several methods for producing transgenic plants have been developed, and the present invention, in particular embodiments, also relates to transformed versions of the wheat variety 25R78.

Numerous methods for plant transformation have been developed, including biological and physical, plant transformation protocols. See, for example, Miki et al., “Procedures for Introducing Foreign DNA into Plants” in Methods in Plant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 67-88. In addition, expression vectors and in vitro culture methods for plant cell or tissue transformation and regeneration of plants are available. See, for example, Gruber et al., “Vectors for Plant Transformation” in Methods in Plant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 89-119.

The most prevalent types of plant transformation involve the construction of an expression vector. Such a vector comprises a DNA sequence that contains a gene under the control of or operatively linked to a regulatory element, for example a promoter. The vector may contain one or more genes and one or more regulatory elements.

Various genetic elements can be introduced into the plant genome using transformation. These elements include but are not limited to genes; coding sequences; inducible, constitutive, and tissue specific promoters; enhancing sequences; and signal and targeting sequences.

A genetic trait which has been engineered into a particular wheat plant using transformation techniques, could be moved into another line using traditional breeding techniques that are well known in the plant breeding arts. For example, a backcrossing approach could be used to move a transgene from a transformed wheat plant to an elite wheat variety and the resulting progeny would comprise a transgene. As used herein, “crossing” can refer to a simple X by Y cross, or the process of backcrossing, depending on the context. The term “cross” excludes the processes of selfing or sibbing.

With transgenic plants according to the present invention, a foreign protein can be produced in commercial quantities. Thus, techniques for the selection and propagation of transformed plants, which are well understood in the art, yield a plurality of transgenic plants which are harvested in a conventional manner, and a foreign protein then can be extracted from a tissue of interest or from total biomass. Protein extraction from plant biomass can be accomplished by known methods which are discussed, for example, by Heney and Orr, Anal. Biochem. 114: 92-6 (1981).

According to a preferred embodiment, the transgenic plant provided for commercial production of foreign protein is a wheat plant. In another preferred embodiment, the biomass of interest is seed. A genetic map can be generated, primarily via conventional RFLP, PCR, and SSR analysis, which identifies the approximate chromosomal location of the integrated DNA molecule. For exemplary methodologies in this regard, see Glick and Thompson, METHODS IN PLANT MOLECULAR BIOLOGY AND BIOTECHNOLOGY 269-284 (CRC Press, Boca Raton, 1993). Map information concerning chromosomal location is useful for proprietary protection of a subject transgenic plant. If unauthorized propagation is undertaken and crosses made with other germplasm, the map of the integration region can be compared to similar maps for suspect plants, to determine if the latter have a common parentage with the subject plant. Map comparisons would involve hybridizations, RFLP, PCR, SSR and sequencing, all of which are conventional techniques.

Likewise, by means of the present invention, agronomic genes can be expressed in transformed plants. More particularly, plants can be genetically engineered to express various phenotypes of agronomic interest. Through the transformation of wheat the expression of genes can be modulated to enhance disease resistance, insect resistance, herbicide resistance, agronomic traits as well as grain quality traits. Transformation can also be used to insert DNA sequences which control or help control male-sterility. DNA sequences native to wheat as well as non-native DNA sequences can be transformed into wheat and used to modulate levels of native or non-native proteins. Anti-sense technology, various promoters, targeting sequences, enhancing sequences, and other DNA sequences can be inserted into the wheat genome for the purpose of modulating the expression of proteins. Exemplary genes implicated in this regard include, but are not limited to, those categorized below.

1. Genes That Confer Resistance To Pests or Disease And That Encode:

(A) Plant disease resistance genes. Plant defenses are often activated by specific interaction between the product of a disease resistance gene (R) in the plant and the product of a corresponding avirulence (Avr) gene in the pathogen. A plant variety can be transformed with a cloned resistance gene to engineer plants that are resistant to specific pathogen strains. See, for example Jones et al., Science 266: 789 (1994) (cloning of the tomato Cf-9 gene for resistance to Cladosporium fulvum); Martin et al., Science 262: 1432 (1993) (tomato Pto gene for resistance to Pseudomonas syringae pv. tomato encodes a protein kinase); Mindrinos et al., Cell 78: 1089 (1994) (Arabidopsis RSP2 gene for resistance to Pseudomonas syringae).

Fusarium head blight along with deoxynivalenol both produced by the pathogen Fusarium graminearum Schwabe have caused devastating losses in wheat production. Genes expressing proteins with antifungal action can be used as transgenes to prevent Fusarium head blight. Various classes of proteins have been identified. Examples include endochitinases, exochitinases, glucanases, thionins, thaumatin-like proteins, osmotins, ribosome inactivating proteins, flavoniods, lactoferricin. During infection with Fusarium graminearum deoxynivalenol is produced. There is evidence that production of deoxynivalenol increases the virulence of the disease. Genes with properties for detoxification of deoxynivalenol (Adam and Lemmens, In International Congress on Molecular Plant-Microbe Interactions, 1996; McCormick et al. Appl. Environ. Micro. 65:5252-5256, 1999) have been engineered for use in wheat. A synthetic peptide that competes with deoxynivalenol has been identified (Yuan et al., Appl. Environ. Micro. 65:3279-3286, 1999). Changing the ribosomes of the host so that they have reduced affinity for deoxynivalenol has also been used to reduce the virulence of the Fusarium graminearum.

Genes used to help reduce Fusarium Head Blight include but are not limited to Tri101(Fusarium), PDR5 (yeast), tlp-1(oat), tip-2(oat), leaf tip-1 (wheat), tlp (rice), tlp-4 (oat), endochitinase, exochitinase, glucanase (Fusarium), permatin (oat), seed hordothionin (barley), α-thionin (wheat), acid glucanase (alfalfa), chitinase (barley and rice), class βll-1,3-glucanase (barley), PR5/tlp (arabidopsis), zeamatin (maize), type 1 RIP (barley), NPR1 (arabidopsis), lactoferrin (mammal), oxalyl-CoA-decarboxylase (bacterium), IAP(baculovirus), ced-9 (C. elegans), and glucanase (rice and barley).

(B) A gene conferring resistance to a pest, such as Hessian fly, wheat, stem soft fly, cereal leaf beetle, and/or green bug. For example the H9, H10, and H21 genes.

(C) A gene conferring resistance to disease, including wheat rusts, septoria tritici, septoria nodorum, powdery mildew, helminthosporium diseases, smuts, bunts, fusarium diseases, bacterial diseases, and viral diseases.

(D) A Bacillus thuringiensis protein, a derivative thereof or a synthetic polypeptide modeled thereon. See, for example, Geiser et al., Gene 48: 109 (1986), who disclose the cloning and nucleotide sequence of a Bt δ-endotoxin gene. Moreover, DNA molecules encoding δ-endotoxin genes can be purchased from American Type Culture Collection (Manassas, Va.), for example, under ATCC Accession Nos. 40098, 67136, 31995 and 31998.

(E) A lectin. See, for example, the disclosure by Van Damme et al., Plant Molec. Biol. 24: 25 (1994), who disclose the nucleotide sequences of several Clivia miniata mannose-binding lectin genes.

(F) A vitamin-binding protein such as avidin. See PCT application US93/06487, the contents of which are hereby incorporated by reference. The application teaches the use of avidin and avidin homologues as larvicides against insect pests.

(G) An enzyme inhibitor, for example, a protease or proteinase inhibitor or an amylase inhibitor. See, for example, Abe et al., J. Biol. Chem. 262: 16793 (1987) (nucleotide sequence of rice cysteine proteinase inhibitor), Huub et al., Plant Molec. Biol. 21: 985 (1993) (nucleotide sequence of cDNA encoding tobacco proteinase inhibitor 1), Sumitani et al., Biosci. Biotech. Biochem. 57: 1243 (1993) (nucleotide sequence of Streptomyces nitrosporeus α-amylase inhibitor) and U.S. Pat. No. 5,494,813 (Hepher and Atkinson, issued Feb. 27, 1996).

(H) An insect-specific hormone or pheromone such as an ecdysteroid and juvenile hormone, a variant thereof, a mimetic based thereon, or an antagonist or agonist thereof. See, for example, the disclosure by Hammock et al., Nature 344: 458 (1990), of baculovirus expression of cloned juvenile hormone esterase, an inactivator of juvenile hormone.

(I) An insect-specific peptide or neuropeptide which, upon expression, disrupts the physiology of the affected pest. For example, see the disclosures of Regan, J. Biol. Chem. 269: 9 (1994) (expression cloning yields DNA coding for insect diuretic hormone receptor), and Pratt et al., Biochem. Biophys. Res. Comm. 163: 1243 (1989) (an allostatin is identified in Diploptera puntata). See also U.S. Pat. No. 5,266,317 to Tomalski et al., who disclose genes encoding insect-specific, paralytic neurotoxins.

(J) An insect-specific venom produced in nature by a snake, a wasp, etc. For example, see Pang et al., Gene 116: 165 (1992), for disclosure of heterologous expression in plants of a gene coding for a scorpion insectotoxic peptide.

(K) An enzyme responsible for an hyperaccumulation of a monterpene, a sesquiterpene, a steroid, hydroxamic acid, a phenylpropanoid derivative or another non-protein molecule with insecticidal activity.

(L) An enzyme involved in the modification, including the post-translational modification, of a biologically active molecule; for example, a glycolytic enzyme, a proteolytic enzyme, a lipolytic enzyme, a nuclease, a cyclase, a transaminase, an esterase, a hydrolase, a phosphatase, a kinase, a phosphorylase, a polymerase, an elastase, a chitinase and a glucanase, whether natural or synthetic. See PCT application WO 93/02197 in the name of Scott et al., which discloses the nucleotide sequence of a callase gene. DNA molecules which contain chitinase-encoding sequences can be obtained, for example, from the ATCC under Accession Nos. 39637 and 67152. See also Kramer et al., Insect Biochem. Molec. Biol. 23: 691 (1993), who teach the nucleotide sequence of a cDNA encoding tobacco hookworm chitinase, and Kawalleck et al., Plant Molec. Biol. 21: 673 (1993), who provide the nucleotide sequence of the parsley ubi4-2 polyubiquitin gene.

(M) A molecule that stimulates signal transduction. For example, see the disclosure by Botella et al., Plant Molec. Biol. 24: 757 (1994), of nucleotide sequences for mung bean calmodulin cDNA clones, and Griess et al., Plant Physiol. 104: 1467 (1994), who provide the nucleotide sequence of a maize calmodulin cDNA clone.

(N) A hydrophobic moment peptide. See PCT application WO95/16776 (disclosure of peptide derivatives of Tachyplesin which inhibit fungal plant pathogens) and PCT application WO95/18855 (teaches synthetic antimicrobial peptides that confer disease resistance), the respective contents of which are hereby incorporated by reference.

(O) A membrane permease, a channel former or a channel blocker. For example, see the disclosure by Jaynes et al., Plant Sci. 89: 43 (1993), of heterologous expression of a cecropin-β lytic peptide analog to render transgenic tobacco plants resistant to Pseudomonas solanacearum.

(P) A viral-invasive protein or a complex toxin derived therefrom. For example, the accumulation of viral coat proteins in transformed plant cells imparts resistance to viral infection and/or disease development effected by the virus from which the coat protein gene is derived, as well as by related viruses. See Beachy et al., Ann. Rev. Phytopathol. 28: 451 (1990). Coat protein-mediated resistance has been conferred upon transformed plants against alfalfa mosaic virus, cucumber mosaic virus, tobacco streak virus, potato virus X, potato virus Y, tobacco etch virus, tobacco rattle virus and tobacco mosaic virus. Id.

(Q) An insect-specific antibody or an immunotoxin derived therefrom. Thus, an antibody targeted to a critical metabolic function in the insect gut would inactivate an affected enzyme, killing the insect. Cf. Taylor et al, Abstract #497, SEVENTH INT'L SYMPOSIUM ON MOLECULAR PLANT-MICROBE INTERACTIONS (Edinburgh, Scotland, 1994) (enzymatic in activation in transgenic tobacco via production of single-chain antibody fragments).

(R) A virus-specific antibody. See, for example, Tavladoraki et al., Nature 366: 469 (1993), who show that transgenic plants expressing recombinant antibody genes are protected from virus attack.

(S) A developmental-arrestive protein produced in nature by a pathogen or a parasite. Thus, fungal endo α-1,4-D-polygalacturonases facilitate fungal colonization and plant nutrient release by solubilizing plant cell wall homo-α-1,4-D-galacturonase. See Lamb et al., Bio/Technology 10: 1436 (1992). The cloning and characterization of a gene which encodes a bean endopolygalacturonase-inhibiting protein is described by Toubart et al., Plant J. 2: 367 (1992).

(T) A developmental-arrestive protein produced in nature by a plant. For example, Logemann et al., Bio/Technology 10: 305 (1992), have shown that transgenic plants expressing the barley ribosome-inactivating gene have an increased resistance to fungal disease.

2. Genes that Confer Resistance to a Herbicide, for Example:

(A) Acetohydroxy acid synthase, which has been found to make plants that express this enzyme resistant to multiple types of herbicides, has been introduced into a variety of plants (see, e.g., Hattori et al. (1995) Mol Gen Genet 246:419). Other genes that confer tolerance to herbicides include: a gene encoding a chimeric protein of rat cytochrome P4507A1 and yeast NADPH-cytochrome P450 oxidoreductase (Shiota et al. (1994) Plant PhysiolPlant Physiol 106:17), genes for glutathione reductase and superoxide dismutase (Aono et al. (1995) Plant Cell Physiol 36:1687, and genes for various phosphotransferases (Datta et al. (1992) Plant Mol Biol 20:619).

(B) A herbicide that inhibits the growing point or meristem, such as an imidazalinone or a sulfonylurea. Exemplary genes in this category code for mutant ALS and AHAS enzyme as described, for example, by Lee et al., EMBO J. 7: 1241 (1988), and Miki et al., Theor. Appl. Genet. 80: 449 (1990), respectively. See also, U.S. Pat. Nos. 5,605,011; 5,013,659; 5,141,870; 5,767,361; 5,731,180; 5,304,732; 4,761,373; 5,331,107; 5,928,937; and 5,378,824; and international publication WO 96/33270, which are incorporated herein by reference in their entireties for all purposes.

(C) Glyphosate (resistance imparted by mutant 5-enolpyruvl-3-phosphikimate synthase (EPSP) and aroA genes, respectively) and other phosphono compounds such as glufosinate (phosphinothricin acetyl transferase, PAT) and Streptomyces hygroscopicus phosphinothricin-acetyl transferase, bar, genes), and pyridinoxy or phenoxy propionic acids and cycloshexones (ACCase inhibitor-encoding genes). See, for example, U.S. Pat. No. 4,940,835 to Shah et al., which discloses the nucleotide sequence of a form of EPSPS which can confer glyphosate resistance. In U.S. Pat. No. 5,627,061 to Barry et al. describes genes encoding EPSPS enzymes. In US 2002/0062503 A1 Chen et al. describe a wheat plant tolerant to glyphosate. The DNA construct pMON30139 was inserted in wheat via transformation and contains the EPSPS gene as well as other elements. See also U.S. Pat. Nos. 6,248,876 B1; 5,804,425; 5,633,435; 5,145,783; 4,971,908; 5,312,910; 5,188,642; 4,940,835; 5,866,775; 6,225,114 B1; 6,130,366; 5,310,667; 4,535,060; 4,769,061; 5,633,448; 5,510,471; Re. 36,449; RE 37,287 E; and U.S. Pat. No. 5,491,288; and international publications WO 97/04103; WO 00/66746; WO 01/66704; and WO 00/66747, which are incorporated herein by reference in their entireties for all purposes. Glyphosate resistance is also imparted to plants that express a gene that encodes a glyphosate oxido-reductase enzyme as described more fully in U.S. Pat. Nos. 5,776,760 and 5,463,175, which are incorporated herein by reference in their entireties for all purposes. In addition glyphosate resistance can be imparted to plants by the over expression of genes encoding glyphosate N-acetyltransferase. See, for example, U.S. Application Ser. Nos. 60/244,385; 60/377,175 and 60/377,719.

A DNA molecule encoding a mutant aroA gene can be obtained under ATCC accession No. 39256, and the nucleotide sequence of the mutant gene is disclosed in U.S. Pat. No. 4,769,061 to Comai. European Patent application No. 0 333 033 to Kumada et al. and U.S. Pat. No. 4,975,374 to Goodman et al. disclose nucleotide sequences of glutamine synthetase genes which confer resistance to herbicides such as L-phosphinothricin. The nucleotide sequence of a phosphinothricin-acetyl-transferase gene is provided in European application No. 0 242 246 to Leemans et al. De Greef et al., Bio/Technology 7: 61 (1989), describe the production of transgenic plants that express chimeric bar genes coding for phosphinothricin acetyl transferase activity. See also, U.S. Pat. Nos. 5,969,213; 5,489,520; 5,550,318; 5,874,265; 5,919,675; 5,561,236; 5,648,477; 5,646,024; 6,177,616 B1; and U.S. Pat. No. 5,879,903, which are incorporated herein by reference in their entireties for all purposes. Vasil et al. (Bio/Technology 10:667,1992) reported developing wheat plants resistant to glufosinate via particle bombardment and the use of bar genes. The use of bar genes has also resulted in the resistance to the herbicide bialaphos. Exemplary of genes conferring resistance to phenoxy propionic acids and cycloshexones, such as sethoxydim and haloxyfop, are the Acc1-S1, Acc1-S2 and Acc1-S3 genes described by Marshall et al., Theor. Appl. Genet. 83: 435 (1992).

(D) A herbicide that inhibits photosynthesis, such as a triazine (psbA and gs+genes) and a benzonitrile (nitrilase gene). Przibilla et al., Plant Cell 3: 169 (1991), describe the transformation of Chlamydomonas with plasmids encoding mutant psbA genes. Nucleotide sequences for nitrilase genes are disclosed in U.S. Pat. No. 4,810,648 to Stalker, and DNA molecules containing these genes are available under ATCC Accession Nos. 53435, 67441 and 67442. Cloning and expression of DNA coding for a glutathione S-transferase is described by Hayes et al., Biochem. J. 285: 173 (1992).

(E) Protoporphyrinogen oxidase (protox) is necessary for the production of chlorophyll, which is necessary for all plant survival. The protox enzyme serves as the target for a variety of herbicidal compounds. These herbicides also inhibit growth of all the different species of plants present, causing their total destruction. The development of plants containing altered protox activity which are resistant to these herbicides are described in U.S. Pat. Nos. 6,288,306 B1; 6,282,837 B1; and 5,767,373; and international publication WO 01/12825, which are incorporated herein by reference in their entireties for all purposes.

3. Genes that Confer or Improve Grain Quality, Such As:

(A) The content of high-molecular-weight gluten subunits (HMW-GS). Genomic clones have been isolated for different HMW subunits (Anderson et al., In Proceedings of the 7^(th) International Wheat Genetics Symposium, IPR, pp. 699-704, 1988; Shewry et al. In Oxford Surveys of Plant Molecular and Cell Biology, pp. 163-219, 1989; Shewry et al. Journal of Cereal Sci. 15:105-120, 1992). Blechl et al. (Journal of Plant Phys. 152 (6): 703-707, 1998) have transformed wheat with genes that encode a modified HMW-GS. See also U.S. Pat. Nos. 5,650,558; 5,914,450; 5,985,352; 6,174,725; and 6,252,134, which are incorporated herein by reference in their entireties for all purposes.

(B) Modified fatty acid metabolism, for example, by transforming a plant with an antisense gene of stearoyl-ACP desaturase to increase stearic acid content of the plant. See Knultzon et al., Proc. Nat'l. Acad. Sci. USA 89: 2624 (1992).

(C) Decreased phytate content for example introduction of a phytase-encoding gene would enhance breakdown of phytate, adding more free phosphate to the transformed plant. For example, see Van Hartingsveldt et al., Gene 127: 87 (1993), for a disclosure of the nucleotide sequence of an Aspergillus niger phytase gene.

(D) Modified carbohydrate composition effected, for example, by transforming plants with a gene coding for an enzyme that alters the branching pattern of starch. See Shiroza et al., J. Bacteriol. 170: 810 (1988) (nucleotide sequence of Streptococcus mutans fructosyltransferase gene), Steinmetz et al., Mol. Gen. Genet. 200: 220 (1985) (nucleotide sequence of Bacillus subtilis levansucrase gene), Pen et al., Bio/Technology 10: 292 (1992) (production of transgenic plants that express Bacillus licheniformis α-amylase), Elliot et al., Plant Molec. Biol. 21: 515 (1993) (nucleotide sequences of tomato invertase genes), Søgaard et al., J. Biol. Chem. 268: 22480 (1993) (site-directed mutagenesis of barley α-amylase gene), and Fisher et al., Plant Physiol. 102: 1045 (1993) (maize endosperm starch branching enzyme II).

4. Genes that Control Male-sterility

(A) Introduction of a deacetylase gene under the control of a tapetum-specific promoter and with the application of the chemical N-Ac-PPT (WO 01/29237).

(B) Introduction of various stamen-specific promoters (WO 92/13956, WO 92/13957).

(C) Introduction of the barnase and the barstar gene (Paul et al. Plant Mol. Biol. 19:611-622, 1992).

5. Genes that Confer Agronomic Enhancements, Nutritional Enhancements, or Industrial Enhancements. For example, the barley HVA1 gene was transformed into wheat. Transformed wheat plants showed increased tolerance to water stress, (Sivamani, E. et al. Plant Science 2000, V. 155 p1-9 and U.S. Pat. No. 5,981,842.)

Numerous methods for plant transformation have been developed, including biological and physical, plant transformation protocols. See, for example, Miki et al., “Procedures for Introducing Foreign DNA into Plants” in Methods in Plant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 67-88. In addition, expression vectors and in vitro culture methods for plant cell or tissue transformation and regeneration of plants are available. See, for example, Gruber et al., “Vectors for Plant Transformation” in Methods in Plant Molecular Biology and Biotechnology, Glick, B. R. and Thompson, J. E. Eds. (CRC Press, Inc., Boca Raton, 1993) pages 89-119.

Single Gene Conversions

A further embodiment of the invention is a single gene conversion of wheat variety 25R78. A single gene conversion occurs when DNA sequences are introduced through traditional (non-transformation) breeding techniques, such as backcrossing. DNA sequences, whether naturally occurring or transgenes, may be introduced using these traditional breeding techniques. Desired traits transferred through this process include, but are not limited to nutritional enhancements, industrial enhancements, disease resistance, insect resistance, herbicide resistance, agronomic enhancements, grain quality enhancement, breeding enhancements, and seed production enhancements. Examples of genes for such traits include: Leaf rust resistance genes (Lr series such as Lr1, Lr10, Lr21, Lr22, Lr22a, Lr32, Lr37, Lr41, Lr42, and Lr43), Fusarium head blight-resistance genes (QFhs.ndsu-3B and QFhs.ndsu-2A), Powdery Mildew resistance genes (Pm21), common bunt resistance genes (Bt-10), and wheat streak mosaic virus resistance gene (Wsm1), Russian wheat aphid resistance genes (Dn series such as Dn1, Dn2, Dn4, Dn5), Black stem rust resistance genes (Sr38), Yellow rust resistance genes (Yr series such as Yr1, YrSD, Yrsu, Yr17, Yr15, YrH52), Aluminum tolerance genes (Alt(BH)), dwarf genes (Rht), vernalization genes (Vrn), Hessian fly resistance genes (H9, H10, H21, H29), grain color genes (R/r), glyphosate resistance genes (EPSPS), and glufosinate genes (bar, pat). The trait of interest is transferred from the donor parent to the recurrent parent, in this case, the wheat plant disclosed herein. Single gene traits may result from either the transfer of a dominant allele or a recessive allele. Selection of progeny containing the trait of interest is done by direct selection for a trait associated with a dominant allele. Selection of progeny for a trait that is transferred via a recessive allele requires growing and selfing the first backcross to determine which plants carry the recessive alleles. Recessive traits may require additional progeny testing in successive backcross generations to determine the presence of the gene of interest.

Use in Plant Breeding

This invention also is directed to methods for using wheat variety 25R78 in plant breeding.

One such embodiment is the method of crossing wheat variety 25R78 with another variety of wheat to form a first generation population of F1 plants. The population of first generation F1 plants produced by this method is also an embodiment of the invention. This first generation population of F1 plants will comprise an essentially complete set of the alleles of wheat variety 25R78. One of ordinary skill in the art can utilize either breeder books or molecular methods to identify a particular F1 plant produced using wheat variety 25R78, and any such individual plant is also encompassed by this invention. These embodiments also cover use of these methods with transgenic or single gene conversions of wheat variety 25R78.

Another embodiment of this invention is a method of using wheat variety in breeding that involves the repeated backcrossing to wheat variety 25R78 any number of times. Using backcrossing methods, or the transgenic methods described above, the single gene conversion methods above, or other breeding methods known to one of ordinary skill in the art, one can develop individual plants and populations of plants that retain at least 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% or 99.5% of the genetic profile of wheat variety 25R78. The percentage of the genetics retained in the progeny may be measured by either pedigree analysis or through the use of genetic techniques such as molecular markers or electrophoresis. In pedigree analysis, on average 50% of the starting germplasm would be passed to the progeny line after one cross to another line, 25% after another cross to a different line, and so on. Molecular markers could also be used to confirm and/or determine the pedigree of the progeny line.

A specific method for producing a line derived from wheat variety 25R78 is as follows. One of ordinary skill in the art would cross wheat variety 25R78 with another variety of wheat, such as an elite variety. The F1 seed derived from this cross would be grown to form a homogeneous population. The F1 seed would contain 100% of the alleles from variety 25R78 and 100% of the alleles from the other wheat variety. The F1 genome would be made-up of 50% variety 25R78 and 50% of the other elite variety. The F1 seed would be grown and allowed to self, thereby forming F2 seed. On average the F2 seed would have derived 50% of its alleles from variety 25R78 and 50% from the other wheat variety, but various individual plants from the population would have a much greater percentage of their alleles derived from 25R78 (Wang J. and R. Bernardo, 2000, Crop Sci. 40:659-665 and Bernardo, R. and A. L. Kahler, 2001, Theor. Appl. Genet 102:986-992). The F2 seed would be grown and selection of plants would be made based on visual observation and/or measurement of traits. The traits used for selection may be the wheat variety 25R78 traits of comparably high yield, comparably very good resistance to leaf rust, comparably good resistance to powdery mildew, comparably very good winter hardiness, comparably very good milling qualities, and comparably early maturity. The 25R78-derived progeny that exhibit one or more of the desired 25R78-derived traits, such as those listed above, would be selected and each plant would be harvested separately. This F3 seed from each plant would be grown in individual rows and allowed to self. Then selected rows or plants from the rows would be harvested and threshed individually. The selections would again be based on visual observation and/or measurements for desirable traits of the plants, such as one or more of the desirable 25R78-derived traits listed above. The process of growing and selection would be repeated any number of times until a homozygous 25R78-derived wheat plant is obtained. The homozygous 25R78-derived wheat plant would contain desirable traits derived from wheat variety 25R78, some of which may not have been expressed by the other original wheat variety to which wheat variety 25R78 was crossed and some of which may have been expressed by both wheat varieties but now would be at a level equal to or greater than the level expressed in wheat variety 25R78. The homozygous 25R78-derived wheat plants would have, on average, 50% of their genes derived from wheat variety 25R78, but various individual plants from the population would have a much greater percentage of their alleles derived from 25R78. The breeding process, of crossing, selfing, and selection may be repeated to produce another population of 25R78-derived wheat plants with, on average, 25% of their genes derived from wheat variety 25R78, but various individual plants from the population would have a much greater percentage of their alleles derived from 25R78. Another embodiment of the invention is a homozygous 25R78-derived wheat plant that has received desirable 25R78-derived traits selected from the group consisting of: comparably high yield, comparably very good resistance to leaf rust, comparably good resistance to powdery mildew, comparably very good winter hardiness, comparably very good milling qualities, and comparably early maturity.

The previous example can be modified in numerous ways, for-instance selection may or may not occur at every selfing generation, selection may occur before or after the actual self-pollination process occurs, or individual selections may be made by harvesting individual spikes, plants, rows or plots at any point during the breeding process described. In addition, double haploid breeding methods may be used at any step in the process. The population of plants produced at each and any generation of selfing is also an embodiment of the invention, and each such population would consist of plants containing approximately 50% of its genes from wheat variety 25R78, 25% of its genes from wheat variety 25R78 in the second cycle of crossing, selfing, and selection, 12.5% of its genes from wheat variety 25R78 in the third cycle of crossing, selfing, and selection, and so on.

Another embodiment of this invention is the method of obtaining a homozygous 25R78-derived wheat plant by crossing wheat variety 25R78 with another variety of wheat and applying double haploid methods to the F1 seed or F1 plant or to any generation of 25R78-derived wheat obtained by the selfing of this cross.

Still further, this invention also is directed to methods for producing 25R78-derived wheat plants by crossing wheat variety 25R78 with a wheat plant and growing the progeny seed, and repeating the crossing or selfing along with the growing steps with the 25R78derived wheat plant from 1 to 2 times, 1 to 3 times, 1 to 4 times, or 1 to 5 times. Thus, any and all methods using wheat variety 25R78 in breeding are part of this invention, including selfing, pedigree breeding, backcrosses, hybrid production and crosses to populations. All plants and populations of plants produced using wheat variety 25R78 as a parent are within the scope of this invention. Unique starch profiles, molecular marker profiles and/or breeding records can be used by those of ordinary skill in the art to identify the progeny lines or populations of progeny derived from wheat variety 25R78.

All plants produced using wheat variety 25R78 as a parent are within the scope of this invention, including those developed from varieties derived from wheat variety 25R78

Performance Examples of 25R78

In the examples that follow, the traits and characteristics of wheat variety 25R78 are given in paired comparisons with another variety during the same growing conditions and the same year. The data collected on each wheat variety is presented for key characteristics and traits.

The results in Table 2A compare variety 25R78 to three other similarly adapted Pioneer wheat varieties, 2540, 25R26, and 25R57. The results show that variety 25R78 yielded significantly more and had significantly greater test weight than wheat varieties 2540, 25R26, and 25R57. Wheat variety 25R78 had significantly earlier heading date than the other three varieties. Wheat variety 25R78 also scored significantly better than varieties 2540 and 25R57 for leaf rust resistance.

The results in Table 2B compare wheat variety 25R78 to three others similarly adapted Pioneer wheat varieties, 2552, 2684, and 2568. The results show that variety 25R78 yielded significantly more than the other three varieties. Variety 25R78 had a significantly better score than variety 2552 for leaf rust resistance. Variety 25R78 also score significantly better than varieties 2684 and 2568 for leaf blight resistance.

The results in Table 3 show values for the grain quality of variety 25R78 and three other similarly adapted Pioneer wheat varieties, 2540, 25R26 and 25R57. The results show that the grain of variety 25R78 has very flour yield and break flour yield.

TABLE 2A Varietal performance and agronomic characteristics of 25R78 of Pioneer Elite yield tests during the period 1998-2001 Grain Test Straw Plant Heading Powdery Leaf Leaf Yield Weight Lodging Height Date Mildew Rust Blight SSMV* SBMV** Variety Bu/ac lb/bu 1-9@ cm Jan 1 1-9@ 1-9@ 1-9@ 1-9@ 1-9@ 25R78 97.2 58.1 7 95.8 125.0 7.0 7.9 4.0 5.3 6.5 2540 89.1 56.6 5.4 99.6 129.8 7.8 4.8 4.3 7.4 6.5 25R26 90.5 55.8 5.9 96.3 129.9 6.3 8.9 3.5 7.9 7.5 25R57 89.3 56.4 6.3 101.3 126.6 7.8 6.3 4.8 4.5 3.0 Isd 2.26 0.48 1 2.55 0.87 0.94 0.85 1.12 0.8 1.33 (P = 0.05) environments 91 83 15 14 14 4 10 8 12 4 years 4 4 3 4 4 1 3 2 2 3 *SSMV = Spindle Streak Mosiac Virus **SBMV = Soil-bourne Mosiac Virus @Scale of 1-9 where 9 = excellent or resistant, 1 = poor or susceptible. SBMV data gathered at the University of Illinois SBMV nursery. Data in above table gathered at Carlisle, IN, Ft. Branch, IN, Howe, IN, Westport, IN, Altamont, IL, Mascoutah, IL, Ridgway, IL, Blissfield, MI, Truxton, MO, Bucyrus, OH, Greenville, OH, and Hamler, OH.

TABLE 2B Varietal performance and agronomic characteristics of 25R78 from Pioneer Elite yield tests during the period 1999-2001. Grain Test Plant Heading Leaf Leaf Yield Weight Height Date Rust Blight Variety Bu/ac lb/bu Cm Jan 1 1-9@ 1-9@ 25R78 98.2 60.4 98.3 110.5 8.3 5.0 2552 92.8 60.5 100.6 111.9 5.3 6.5 2684 90.4 60.5 97.5 106.6 8.7 3.5 2568 91.2 58.7 100.3 111.2 7.7 4.0 Isd 4.76 0.72 2.71 1.45 1.67 1 (P = 0.05) environments 32 26 19 14 3 2 Years 3 3 3 3 1 1 @Scale of 1-9 where 9 = excellent or resistant, 1 = poor or susceptible Data in above table gathered at Ft. Branch, IN, Owensboro, KY, Fulton, KY, Russelville, KY, Clarkedale, AR, Hoxie, AR, Brinkley, AR, and Sykeston, MO

TABLE 3 Soft wheat quality data from the Pioneer Quality Lab in Johnston, IA 1997-2000 Flour Break Flour Cookie Milling Bake Yield Flr Yld Protein AWRC Diam Score Score Variety % % % % Cm 1-9@ 1-9@ 25R78 71.9 40.4 8.3 57.1 18.4 7 4 2540 70.2 38.4 8.8 55.8 19.0 5 6 25R26 71.9 38.5 8.6 56.0 18.2 6 3 25R57 70.8 38.8 8.4 53.8 19.0 6 7 #observ 7(12-14) 7(14-16) 7(14-16) 7(14-16) 7(14-16) Number of observations - values in parentheses are for check varieties. Trait abbreviations used in the above table: AWRC = Alkaline Water Retention Capacity Cookie = Cookie diameter in cm Milling score = a score which weights flour yield 60% and Break flour yield 40%. (1 = poor, 9 = excellent) Baking score = a rating which weights cookie spread 60% and AWRC 40%. (1 = poor, 9 = excellent)

Deposits Applicant(s) have made a deposit of at least 2500 seed of Wheat Variety 25R78 with the American Type Culture Collection (ATCC), 10801 University Boulevard, Manassas, Va. 20110-2209 USA, ATCC Deposit No. PTA-5619. The seeds deposited with the ATCC on Oct. 24, 2003 were taken tom the deposit maintained by Pioneer Hi-Bred International, Inc., 800 Capital Square, 400 Locust Street, Des Moines, Iowa 50309-2340, since prior to the filing date of this application. Access to this deposit will be available during thc pendency of the application to the Commissioner of Patents and Trademarks and persons determined by the Commissioner to be entitled thereto upon request. Upon allowance of any claims in the application, the Applicants(s) will make available to the public, pursuant to 37 C.F.R, § 1.808, a sample(s) of the deposit of at least 2500 seeds of variety 25R78 with the American Type Culture Collection (ATCC), 10801 University Boulevard, Manassas, Va. 20110-2209. This deposit of seed of Wheat Variety 25R78 will be maintained in the ATCC Depository, which is a public depository period of 30 years, or 5 years after the most recent request, or for the enforceable life of the patent, whichever is longer, and will be replaced if it becomes nonviable during that period. Additionally, Applicants(s) have satisfied all the requirements of 37 C.F.R. §§ 1.801-1.809, including providing, an indication of the viability of the sample upon deposit. Applicants(s) have no authority to waive any restrictions imposed by law on the transfer of biological material or its transportation in commerce. Applicants(s) do not waive any infringement of their rights granted under this patent or under the Plant Variety Protection Act (7 USC 2321 et seq.).

The foregoing invention has been described in detail by way of illustration and example for purposes of clarity and understanding. However, it will be obvious that certain changes and modifications such as single gene modifications and mutations, somoclonal variants, variant individuals selected from large populations of the plants of the instant variety and the like may be practiced within the scope of the invention, as limited only by the scope of the appended claims.

All publications, patents, and patent applications mentioned in the specification are indicative of the level of those skilled in the art to which this invention pertains. All publications, patents, and patent applications are herein incorporated by reference to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference. 

What is claimed is:
 1. Seed of wheat variety 25R78, representative seed of said variety having been deposited under ATCC Accession No. PTA-5619.
 2. A wheat plant, or part thereof, produced by growing the seed of claim
 1. 3. A tissue culture of regenerable cells produced from the plant of claim
 2. 4. Protoplasts produced from the tissue culture of claim
 3. 5. The tissue culture of claim 2, wherein cells of the tissue culture are from a tissue selected from the group consisting of kernel, head, stem, leaves, root, root tip, pollen, ovule, embryo and flower.
 6. A wheat plant regenerated from the tissue culture of claim 3, said plant having all the morphological and physiological characteristics of wheat variety 25R78, representative seed of said wheat variety deposited under ATCC Accession No. PTA-5619.
 7. A method for producing an F1 wheat seed, comprising crossing the plant of claim 2 with a different wheat plant and harvesting the resulting F1 wheat seed.
 8. A method of producing a male sterile wheat plant comprising transforming the wheat plant of claim 2 with a nucleic acid molecule that confers male sterility.
 9. A male sterile wheat plant produced by the method of claim
 8. 10. A method of producing an herbicide resistant wheat plant comprising transforming the wheat plant of claim 2 with a transgene that confers herbicide resistance.
 11. An herbicide resistant wheat plant produced by the method of claim
 10. 12. The wheat plant of claim 11, wherein the transgene confers resistance to an herbicide selected from the group consisting of: imidazolinone, sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine and benzonitrile.
 13. A method of producing an insect resistant wheat plant comprising transforming the wheat plant of claim 2 with a transgene that confers insect resistance.
 14. An insect resistant wheat plant produced by the method of claim
 13. 15. The wheat plant of claim 14, wherein the transgene encodes a Bacillus thuringiensis endotoxin.
 16. A method of producing a disease resistant wheat plant comprising transforming the wheat plant of claim 2 with a transgene that confers disease resistance.
 17. A disease resistant wheat plant produced by the method of claim
 16. 18. The wheat plant of claim 17, wherein the transgene confers resistance to Fusarium head blight or detoxification of deoxynivalenol.
 19. A method of producing a wheat plant with decreased phytate content comprising transforming the wheat plant of claim 2 with a transgene encoding phytase.
 20. A wheat plant with decreased phytate content produced by the method of claim
 19. 21. A method of producing a wheat plant with modified fatty acid metabolism, protein metabolism or carbohydrate metabolism comprising transforming the wheat plant of claim 2 with a transgene encoding a polypeptide selected from the group consisting of glutenins, gliadins, stearyl-ACP-desaturase, fructosyltransferase, levasucrase, alpha-amylase, invertase and starch branching enzyme.
 22. A wheat plant produced by the method of claim
 21. 23. The wheat plant of claim 22 wherein the transgene confers a trait selected from the group consisting of waxy starch and increased amylose starch.
 24. A wheat plant, or part thereof, having all the physiological and morphological characteristics of the variety 25R78, representative seed of such line having been deposited under ATCC Accession No. PTA-5619.
 25. A method of introducing a desired trait into wheat variety 25R78 comprising: (a) crossing 25R78 plants grown from 25R78 seed, representative seed of which has been deposited under ATCC Accession No. PTA-5619, with plants of another wheat line that comprise a desired trait to produce F1 progeny plants, wherein the desired trait is selected from the group consisting of male sterility, herbicide resistance, insect resistance, and disease resistance; (b) selecting F1 progeny plants that have the desired trait to produce selected F1 progeny plants; (c) crossing the selected progeny plants with the 25R78 plants to produce backcross progeny plants; (d) selecting for backcross progeny plants that have the desired trait and physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 to produce selected backcross progeny plants; and (e) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny plants that comprise the desired trait and all of the physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 26. A plant produced by the method of claim 25, wherein the plant has the desired trait and all of the physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 as determined at the 5% significance level when grown In the same environmental conditions.
 27. The plant of claim 26 wherein the desired trait is herbicide resistance and the resistance is conferred to a herbicide selected from the group consisting of: imidazolinone, sulfonylurea, glyphosate, glufosinate, L-phosphinothricin, triazine and benzonitrile.
 28. The plant of claim 26 wherein the desired trait is insect resistance and the insect resistance is conferred by a transgene encoding a Bacillus thuringiensis endotoxin.
 29. The plant of claim 26 wherein the desired trait is male sterility and the trait is conferred by a cytoplasmic nucleic acid molecule that confers male sterility.
 30. A method of modifying Fusarium head blight resistance or detoxification of deoxynivalenol in wheat variety 25R78 comprising: (a) crossing 25R78 plants grown from 25R78 seed, representative seed of which has been deposited under ATCC Accession No. PTA-5619, with plants of another wheat variety that comprises a nucleic acid molecule encoding a resistance to Fusarium head blight or detoxification of deoxynivalenol; (b) selecting F1 progeny plants that have said nucleic acid molecule to produce selected F1 progeny plants; (c) crossing the selected progeny plants with the 25R78 plants to produce backcross progeny plants; (d) selecting for backcross progeny plants that have said nucleic acid molecule and physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 to produce selected backcross progeny plants; and (e) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny plants that comprise said nucleic acid molecule and have all of the physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 31. A plant produced by the method of claim 30, wherein the plant comprises the nucleic acid molecule and has all of the physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 32. A method of modifying fatty acid, phytic acid metabolism, carbohydrate metabolism, waxy starch or gluten in wheat variety 25R78 comprising: (a) crossing 25R78 plants grown from 25R78 seed, representative seed of which has been deposited under ATCC Accession No. PTA-5619, with plants of another wheat variety that comprises a nucleic acid molecule encoding a polypeptide selected from the group consisting of phytase, stearyl-ACP desaturase, fructosyltransferase, levansucrase, alpha-amylase, invertase, starch branching enzyme, glutenin and gliadin; (b) selecting F1 progeny plants that have said nucleic acid molecule to produce selected F1 progeny plants; (c) crossing the selected progeny plants with the 25R78 plants to produce backcross progeny plants; (d) selecting for backcross progeny plants that have said nucleic acid molecule and physiological and morphological characteristics of wheat variety 25R78 listed In Table 1 to produce selected backcross progeny plants; and (e) repeating steps (c) and (d) three or more times in succession to produce selected fourth or higher backcross progeny plants that comprise said nucleic acid molecule and have all of the physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions.
 33. A plant produced by the method of claim 32, wherein the plant comprises the nucleic acid molecule and has all of the physiological and morphological characteristics of wheat variety 25R78 listed in Table 1 as determined at the 5% significance level when grown in the same environmental conditions. 